1
by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
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/*
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* Interplay MVE File Demuxer
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* Copyright (c) 2003 The FFmpeg Project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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22 |
/**
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* @file
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* Interplay MVE file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* For more information regarding the Interplay MVE file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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* The aforementioned site also contains a command line utility for parsing
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* IP MVE files so that you can get a good idea of the typical structure of
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* such files. This demuxer is not the best example to use if you are trying
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* to write your own as it uses a rather roundabout approach for splitting
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* up and sending out the chunks.
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*/
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#include "libavutil/channel_layout.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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39 |
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40 |
#define CHUNK_PREAMBLE_SIZE 4
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41 |
#define OPCODE_PREAMBLE_SIZE 4
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42 |
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43 |
#define CHUNK_INIT_AUDIO 0x0000
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#define CHUNK_AUDIO_ONLY 0x0001
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#define CHUNK_INIT_VIDEO 0x0002
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#define CHUNK_VIDEO 0x0003
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#define CHUNK_SHUTDOWN 0x0004
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48 |
#define CHUNK_END 0x0005
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49 |
/* these last types are used internally */
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50 |
#define CHUNK_DONE 0xFFFC
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51 |
#define CHUNK_NOMEM 0xFFFD
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52 |
#define CHUNK_EOF 0xFFFE
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53 |
#define CHUNK_BAD 0xFFFF
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54 |
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55 |
#define OPCODE_END_OF_STREAM 0x00
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56 |
#define OPCODE_END_OF_CHUNK 0x01
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57 |
#define OPCODE_CREATE_TIMER 0x02
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58 |
#define OPCODE_INIT_AUDIO_BUFFERS 0x03
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59 |
#define OPCODE_START_STOP_AUDIO 0x04
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60 |
#define OPCODE_INIT_VIDEO_BUFFERS 0x05
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61 |
#define OPCODE_UNKNOWN_06 0x06
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62 |
#define OPCODE_SEND_BUFFER 0x07
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63 |
#define OPCODE_AUDIO_FRAME 0x08
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#define OPCODE_SILENCE_FRAME 0x09
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65 |
#define OPCODE_INIT_VIDEO_MODE 0x0A
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66 |
#define OPCODE_CREATE_GRADIENT 0x0B
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67 |
#define OPCODE_SET_PALETTE 0x0C
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68 |
#define OPCODE_SET_PALETTE_COMPRESSED 0x0D
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69 |
#define OPCODE_UNKNOWN_0E 0x0E
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70 |
#define OPCODE_SET_DECODING_MAP 0x0F
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71 |
#define OPCODE_UNKNOWN_10 0x10
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72 |
#define OPCODE_VIDEO_DATA 0x11
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73 |
#define OPCODE_UNKNOWN_12 0x12
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74 |
#define OPCODE_UNKNOWN_13 0x13
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75 |
#define OPCODE_UNKNOWN_14 0x14
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76 |
#define OPCODE_UNKNOWN_15 0x15
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77 |
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78 |
#define PALETTE_COUNT 256
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79 |
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80 |
typedef struct IPMVEContext { |
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81 |
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82 |
unsigned char *buf; |
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83 |
int buf_size; |
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84 |
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85 |
uint64_t frame_pts_inc; |
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86 |
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87 |
unsigned int video_bpp; |
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88 |
unsigned int video_width; |
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89 |
unsigned int video_height; |
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90 |
int64_t video_pts; |
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91 |
uint32_t palette[256]; |
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92 |
int has_palette; |
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93 |
int changed; |
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94 |
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95 |
unsigned int audio_bits; |
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96 |
unsigned int audio_channels; |
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97 |
unsigned int audio_sample_rate; |
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98 |
enum AVCodecID audio_type; |
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99 |
unsigned int audio_frame_count; |
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100 |
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101 |
int video_stream_index; |
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102 |
int audio_stream_index; |
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103 |
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104 |
int64_t audio_chunk_offset; |
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105 |
int audio_chunk_size; |
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106 |
int64_t video_chunk_offset; |
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107 |
int video_chunk_size; |
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108 |
int64_t decode_map_chunk_offset; |
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109 |
int decode_map_chunk_size; |
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110 |
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111 |
int64_t next_chunk_offset; |
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112 |
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113 |
} IPMVEContext; |
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114 |
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115 |
static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb, |
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116 |
AVPacket *pkt) { |
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117 |
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118 |
int chunk_type; |
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119 |
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120 |
if (s->audio_chunk_offset && s->audio_channels && s->audio_bits) { |
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121 |
if (s->audio_type == AV_CODEC_ID_NONE) { |
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122 |
av_log(NULL, AV_LOG_ERROR, "Can not read audio packet before" |
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123 |
"audio codec is known\n"); |
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124 |
return CHUNK_BAD; |
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125 |
}
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126 |
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127 |
/* adjust for PCM audio by skipping chunk header */
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128 |
if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) { |
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129 |
s->audio_chunk_offset += 6; |
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130 |
s->audio_chunk_size -= 6; |
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131 |
}
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132 |
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133 |
avio_seek(pb, s->audio_chunk_offset, SEEK_SET); |
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134 |
s->audio_chunk_offset = 0; |
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135 |
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136 |
if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size)) |
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137 |
return CHUNK_EOF; |
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138 |
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139 |
pkt->stream_index = s->audio_stream_index; |
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140 |
pkt->pts = s->audio_frame_count; |
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141 |
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142 |
/* audio frame maintenance */
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143 |
if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) |
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s->audio_frame_count += |
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(s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8)); |
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146 |
else
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s->audio_frame_count += |
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148 |
(s->audio_chunk_size - 6 - s->audio_channels) / s->audio_channels; |
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149 |
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150 |
av_log(NULL, AV_LOG_TRACE, "sending audio frame with pts %"PRId64" (%d audio frames)\n", |
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151 |
pkt->pts, s->audio_frame_count); |
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152 |
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153 |
chunk_type = CHUNK_VIDEO; |
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154 |
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155 |
} else if (s->decode_map_chunk_offset) { |
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156 |
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157 |
/* send both the decode map and the video data together */
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158 |
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159 |
if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size)) |
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160 |
return CHUNK_NOMEM; |
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161 |
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162 |
if (s->has_palette) { |
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163 |
uint8_t *pal; |
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164 |
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165 |
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, |
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166 |
AVPALETTE_SIZE); |
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167 |
if (pal) { |
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168 |
memcpy(pal, s->palette, AVPALETTE_SIZE); |
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169 |
s->has_palette = 0; |
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170 |
}
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171 |
}
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172 |
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173 |
if (s->changed) { |
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174 |
ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height); |
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175 |
s->changed = 0; |
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176 |
}
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177 |
pkt->pos= s->decode_map_chunk_offset; |
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178 |
avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET); |
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179 |
s->decode_map_chunk_offset = 0; |
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180 |
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181 |
if (avio_read(pb, pkt->data, s->decode_map_chunk_size) != |
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182 |
s->decode_map_chunk_size) { |
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183 |
av_free_packet(pkt); |
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184 |
return CHUNK_EOF; |
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185 |
}
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186 |
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187 |
avio_seek(pb, s->video_chunk_offset, SEEK_SET); |
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188 |
s->video_chunk_offset = 0; |
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189 |
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190 |
if (avio_read(pb, pkt->data + s->decode_map_chunk_size, |
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191 |
s->video_chunk_size) != s->video_chunk_size) { |
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192 |
av_free_packet(pkt); |
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193 |
return CHUNK_EOF; |
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194 |
}
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195 |
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196 |
pkt->stream_index = s->video_stream_index; |
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197 |
pkt->pts = s->video_pts; |
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198 |
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199 |
av_log(NULL, AV_LOG_TRACE, "sending video frame with pts %"PRId64"\n", pkt->pts); |
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200 |
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201 |
s->video_pts += s->frame_pts_inc; |
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202 |
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203 |
chunk_type = CHUNK_VIDEO; |
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204 |
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205 |
} else { |
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206 |
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207 |
avio_seek(pb, s->next_chunk_offset, SEEK_SET); |
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208 |
chunk_type = CHUNK_DONE; |
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209 |
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210 |
}
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211 |
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212 |
return chunk_type; |
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213 |
}
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214 |
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215 |
/* This function loads and processes a single chunk in an IP movie file.
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216 |
* It returns the type of chunk that was processed. */
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217 |
static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb, |
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218 |
AVPacket *pkt) |
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219 |
{
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220 |
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
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221 |
int chunk_type; |
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222 |
int chunk_size; |
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223 |
unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE]; |
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224 |
unsigned char opcode_type; |
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225 |
unsigned char opcode_version; |
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226 |
int opcode_size; |
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227 |
unsigned char scratch[1024]; |
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228 |
int i, j; |
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229 |
int first_color, last_color; |
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230 |
int audio_flags; |
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231 |
unsigned char r, g, b; |
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232 |
unsigned int width, height; |
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233 |
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234 |
/* see if there are any pending packets */
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235 |
chunk_type = load_ipmovie_packet(s, pb, pkt); |
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236 |
if (chunk_type != CHUNK_DONE) |
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237 |
return chunk_type; |
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238 |
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239 |
/* read the next chunk, wherever the file happens to be pointing */
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240 |
if (avio_feof(pb)) |
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241 |
return CHUNK_EOF; |
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242 |
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
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243 |
CHUNK_PREAMBLE_SIZE) |
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244 |
return CHUNK_BAD; |
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245 |
chunk_size = AV_RL16(&chunk_preamble[0]); |
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246 |
chunk_type = AV_RL16(&chunk_preamble[2]); |
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247 |
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248 |
av_log(NULL, AV_LOG_TRACE, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size); |
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249 |
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250 |
switch (chunk_type) { |
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251 |
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252 |
case CHUNK_INIT_AUDIO: |
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253 |
av_log(NULL, AV_LOG_TRACE, "initialize audio\n"); |
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254 |
break; |
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255 |
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256 |
case CHUNK_AUDIO_ONLY: |
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257 |
av_log(NULL, AV_LOG_TRACE, "audio only\n"); |
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258 |
break; |
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259 |
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260 |
case CHUNK_INIT_VIDEO: |
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261 |
av_log(NULL, AV_LOG_TRACE, "initialize video\n"); |
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262 |
break; |
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263 |
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264 |
case CHUNK_VIDEO: |
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265 |
av_log(NULL, AV_LOG_TRACE, "video (and audio)\n"); |
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266 |
break; |
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267 |
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268 |
case CHUNK_SHUTDOWN: |
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269 |
av_log(NULL, AV_LOG_TRACE, "shutdown\n"); |
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270 |
break; |
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271 |
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272 |
case CHUNK_END: |
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273 |
av_log(NULL, AV_LOG_TRACE, "end\n"); |
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274 |
break; |
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275 |
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276 |
default: |
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277 |
av_log(NULL, AV_LOG_TRACE, "invalid chunk\n"); |
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278 |
chunk_type = CHUNK_BAD; |
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279 |
break; |
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280 |
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281 |
}
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282 |
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283 |
while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) { |
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284 |
||
285 |
/* read the next chunk, wherever the file happens to be pointing */
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286 |
if (avio_feof(pb)) { |
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287 |
chunk_type = CHUNK_EOF; |
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288 |
break; |
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289 |
}
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290 |
if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) != |
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291 |
CHUNK_PREAMBLE_SIZE) { |
|
292 |
chunk_type = CHUNK_BAD; |
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293 |
break; |
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294 |
}
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295 |
||
296 |
opcode_size = AV_RL16(&opcode_preamble[0]); |
|
297 |
opcode_type = opcode_preamble[2]; |
|
298 |
opcode_version = opcode_preamble[3]; |
|
299 |
||
300 |
chunk_size -= OPCODE_PREAMBLE_SIZE; |
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301 |
chunk_size -= opcode_size; |
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302 |
if (chunk_size < 0) { |
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303 |
av_log(NULL, AV_LOG_TRACE, "chunk_size countdown just went negative\n"); |
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304 |
chunk_type = CHUNK_BAD; |
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305 |
break; |
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306 |
}
|
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307 |
||
308 |
av_log(NULL, AV_LOG_TRACE, " opcode type %02X, version %d, 0x%04X bytes: ", |
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309 |
opcode_type, opcode_version, opcode_size); |
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310 |
switch (opcode_type) { |
|
311 |
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312 |
case OPCODE_END_OF_STREAM: |
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313 |
av_log(NULL, AV_LOG_TRACE, "end of stream\n"); |
|
314 |
avio_skip(pb, opcode_size); |
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315 |
break; |
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316 |
||
317 |
case OPCODE_END_OF_CHUNK: |
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318 |
av_log(NULL, AV_LOG_TRACE, "end of chunk\n"); |
|
319 |
avio_skip(pb, opcode_size); |
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320 |
break; |
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321 |
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322 |
case OPCODE_CREATE_TIMER: |
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323 |
av_log(NULL, AV_LOG_TRACE, "create timer\n"); |
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324 |
if ((opcode_version > 0) || (opcode_size != 6)) { |
|
325 |
av_log(NULL, AV_LOG_TRACE, "bad create_timer opcode\n"); |
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326 |
chunk_type = CHUNK_BAD; |
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327 |
break; |
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328 |
}
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329 |
if (avio_read(pb, scratch, opcode_size) != |
|
330 |
opcode_size) { |
|
331 |
chunk_type = CHUNK_BAD; |
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332 |
break; |
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333 |
}
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334 |
s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]); |
|
335 |
av_log(NULL, AV_LOG_TRACE, " %.2f frames/second (timer div = %d, subdiv = %d)\n", |
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336 |
1000000.0 / s->frame_pts_inc, AV_RL32(&scratch[0]), |
|
337 |
AV_RL16(&scratch[4])); |
|
338 |
break; |
|
339 |
||
340 |
case OPCODE_INIT_AUDIO_BUFFERS: |
|
341 |
av_log(NULL, AV_LOG_TRACE, "initialize audio buffers\n"); |
|
342 |
if (opcode_version > 1 || opcode_size > 10 || opcode_size < 6) { |
|
343 |
av_log(NULL, AV_LOG_TRACE, "bad init_audio_buffers opcode\n"); |
|
344 |
chunk_type = CHUNK_BAD; |
|
345 |
break; |
|
346 |
}
|
|
347 |
if (avio_read(pb, scratch, opcode_size) != |
|
348 |
opcode_size) { |
|
349 |
chunk_type = CHUNK_BAD; |
|
350 |
break; |
|
351 |
}
|
|
352 |
s->audio_sample_rate = AV_RL16(&scratch[4]); |
|
353 |
audio_flags = AV_RL16(&scratch[2]); |
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354 |
/* bit 0 of the flags: 0 = mono, 1 = stereo */
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|
355 |
s->audio_channels = (audio_flags & 1) + 1; |
|
356 |
/* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
|
|
357 |
s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8; |
|
358 |
/* bit 2 indicates compressed audio in version 1 opcode */
|
|
359 |
if ((opcode_version == 1) && (audio_flags & 0x4)) |
|
360 |
s->audio_type = AV_CODEC_ID_INTERPLAY_DPCM; |
|
361 |
else if (s->audio_bits == 16) |
|
362 |
s->audio_type = AV_CODEC_ID_PCM_S16LE; |
|
363 |
else
|
|
364 |
s->audio_type = AV_CODEC_ID_PCM_U8; |
|
365 |
av_log(NULL, AV_LOG_TRACE, "audio: %d bits, %d Hz, %s, %s format\n", |
|
366 |
s->audio_bits, s->audio_sample_rate, |
|
367 |
(s->audio_channels == 2) ? "stereo" : "mono", |
|
368 |
(s->audio_type == AV_CODEC_ID_INTERPLAY_DPCM) ? |
|
369 |
"Interplay audio" : "PCM"); |
|
370 |
break; |
|
371 |
||
372 |
case OPCODE_START_STOP_AUDIO: |
|
373 |
av_log(NULL, AV_LOG_TRACE, "start/stop audio\n"); |
|
374 |
avio_skip(pb, opcode_size); |
|
375 |
break; |
|
376 |
||
377 |
case OPCODE_INIT_VIDEO_BUFFERS: |
|
378 |
av_log(NULL, AV_LOG_TRACE, "initialize video buffers\n"); |
|
379 |
if ((opcode_version > 2) || (opcode_size > 8) || opcode_size < 4 |
|
380 |
|| opcode_version == 2 && opcode_size < 8 |
|
381 |
) { |
|
382 |
av_log(NULL, AV_LOG_TRACE, "bad init_video_buffers opcode\n"); |
|
383 |
chunk_type = CHUNK_BAD; |
|
384 |
break; |
|
385 |
}
|
|
386 |
if (avio_read(pb, scratch, opcode_size) != |
|
387 |
opcode_size) { |
|
388 |
chunk_type = CHUNK_BAD; |
|
389 |
break; |
|
390 |
}
|
|
391 |
width = AV_RL16(&scratch[0]) * 8; |
|
392 |
height = AV_RL16(&scratch[2]) * 8; |
|
393 |
if (width != s->video_width) { |
|
394 |
s->video_width = width; |
|
395 |
s->changed++; |
|
396 |
}
|
|
397 |
if (height != s->video_height) { |
|
398 |
s->video_height = height; |
|
399 |
s->changed++; |
|
400 |
}
|
|
401 |
if (opcode_version < 2 || !AV_RL16(&scratch[6])) { |
|
402 |
s->video_bpp = 8; |
|
403 |
} else { |
|
404 |
s->video_bpp = 16; |
|
405 |
}
|
|
406 |
av_log(NULL, AV_LOG_TRACE, "video resolution: %d x %d\n", |
|
407 |
s->video_width, s->video_height); |
|
408 |
break; |
|
409 |
||
410 |
case OPCODE_UNKNOWN_06: |
|
411 |
case OPCODE_UNKNOWN_0E: |
|
412 |
case OPCODE_UNKNOWN_10: |
|
413 |
case OPCODE_UNKNOWN_12: |
|
414 |
case OPCODE_UNKNOWN_13: |
|
415 |
case OPCODE_UNKNOWN_14: |
|
416 |
case OPCODE_UNKNOWN_15: |
|
417 |
av_log(NULL, AV_LOG_TRACE, "unknown (but documented) opcode %02X\n", opcode_type); |
|
418 |
avio_skip(pb, opcode_size); |
|
419 |
break; |
|
420 |
||
421 |
case OPCODE_SEND_BUFFER: |
|
422 |
av_log(NULL, AV_LOG_TRACE, "send buffer\n"); |
|
423 |
avio_skip(pb, opcode_size); |
|
424 |
break; |
|
425 |
||
426 |
case OPCODE_AUDIO_FRAME: |
|
427 |
av_log(NULL, AV_LOG_TRACE, "audio frame\n"); |
|
428 |
||
429 |
/* log position and move on for now */
|
|
430 |
s->audio_chunk_offset = avio_tell(pb); |
|
431 |
s->audio_chunk_size = opcode_size; |
|
432 |
avio_skip(pb, opcode_size); |
|
433 |
break; |
|
434 |
||
435 |
case OPCODE_SILENCE_FRAME: |
|
436 |
av_log(NULL, AV_LOG_TRACE, "silence frame\n"); |
|
437 |
avio_skip(pb, opcode_size); |
|
438 |
break; |
|
439 |
||
440 |
case OPCODE_INIT_VIDEO_MODE: |
|
441 |
av_log(NULL, AV_LOG_TRACE, "initialize video mode\n"); |
|
442 |
avio_skip(pb, opcode_size); |
|
443 |
break; |
|
444 |
||
445 |
case OPCODE_CREATE_GRADIENT: |
|
446 |
av_log(NULL, AV_LOG_TRACE, "create gradient\n"); |
|
447 |
avio_skip(pb, opcode_size); |
|
448 |
break; |
|
449 |
||
450 |
case OPCODE_SET_PALETTE: |
|
451 |
av_log(NULL, AV_LOG_TRACE, "set palette\n"); |
|
452 |
/* check for the logical maximum palette size
|
|
453 |
* (3 * 256 + 4 bytes) */
|
|
454 |
if (opcode_size > 0x304 || opcode_size < 4) { |
|
455 |
av_log(NULL, AV_LOG_TRACE, "demux_ipmovie: set_palette opcode with invalid size\n"); |
|
456 |
chunk_type = CHUNK_BAD; |
|
457 |
break; |
|
458 |
}
|
|
459 |
if (avio_read(pb, scratch, opcode_size) != opcode_size) { |
|
460 |
chunk_type = CHUNK_BAD; |
|
461 |
break; |
|
462 |
}
|
|
463 |
||
464 |
/* load the palette into internal data structure */
|
|
465 |
first_color = AV_RL16(&scratch[0]); |
|
466 |
last_color = first_color + AV_RL16(&scratch[2]) - 1; |
|
467 |
/* sanity check (since they are 16 bit values) */
|
|
468 |
if ( (first_color > 0xFF) || (last_color > 0xFF) |
|
469 |
|| (last_color - first_color + 1)*3 + 4 > opcode_size) { |
|
470 |
av_log(NULL, AV_LOG_TRACE, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n", |
|
471 |
first_color, last_color); |
|
472 |
chunk_type = CHUNK_BAD; |
|
473 |
break; |
|
474 |
}
|
|
475 |
j = 4; /* offset of first palette data */ |
|
476 |
for (i = first_color; i <= last_color; i++) { |
|
477 |
/* the palette is stored as a 6-bit VGA palette, thus each
|
|
478 |
* component is shifted up to a 8-bit range */
|
|
479 |
r = scratch[j++] * 4; |
|
480 |
g = scratch[j++] * 4; |
|
481 |
b = scratch[j++] * 4; |
|
482 |
s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); |
|
483 |
s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
|
484 |
}
|
|
485 |
s->has_palette = 1; |
|
486 |
break; |
|
487 |
||
488 |
case OPCODE_SET_PALETTE_COMPRESSED: |
|
489 |
av_log(NULL, AV_LOG_TRACE, "set palette compressed\n"); |
|
490 |
avio_skip(pb, opcode_size); |
|
491 |
break; |
|
492 |
||
493 |
case OPCODE_SET_DECODING_MAP: |
|
494 |
av_log(NULL, AV_LOG_TRACE, "set decoding map\n"); |
|
495 |
||
496 |
/* log position and move on for now */
|
|
497 |
s->decode_map_chunk_offset = avio_tell(pb); |
|
498 |
s->decode_map_chunk_size = opcode_size; |
|
499 |
avio_skip(pb, opcode_size); |
|
500 |
break; |
|
501 |
||
502 |
case OPCODE_VIDEO_DATA: |
|
503 |
av_log(NULL, AV_LOG_TRACE, "set video data\n"); |
|
504 |
||
505 |
/* log position and move on for now */
|
|
506 |
s->video_chunk_offset = avio_tell(pb); |
|
507 |
s->video_chunk_size = opcode_size; |
|
508 |
avio_skip(pb, opcode_size); |
|
509 |
break; |
|
510 |
||
511 |
default: |
|
512 |
av_log(NULL, AV_LOG_TRACE, "*** unknown opcode type\n"); |
|
513 |
chunk_type = CHUNK_BAD; |
|
514 |
break; |
|
515 |
||
516 |
}
|
|
517 |
}
|
|
518 |
||
519 |
/* make a note of where the stream is sitting */
|
|
520 |
s->next_chunk_offset = avio_tell(pb); |
|
521 |
||
522 |
/* dispatch the first of any pending packets */
|
|
523 |
if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY)) |
|
524 |
chunk_type = load_ipmovie_packet(s, pb, pkt); |
|
525 |
||
526 |
return chunk_type; |
|
527 |
}
|
|
528 |
||
529 |
static const char signature[] = "Interplay MVE File\x1A\0\x1A"; |
|
530 |
||
531 |
static int ipmovie_probe(AVProbeData *p) |
|
532 |
{
|
|
533 |
const uint8_t *b = p->buf; |
|
534 |
const uint8_t *b_end = p->buf + p->buf_size - sizeof(signature); |
|
535 |
do { |
|
536 |
if (b[0] == signature[0] && memcmp(b, signature, sizeof(signature)) == 0) |
|
537 |
return AVPROBE_SCORE_MAX; |
|
538 |
b++; |
|
539 |
} while (b < b_end); |
|
540 |
||
541 |
return 0; |
|
542 |
}
|
|
543 |
||
544 |
static int ipmovie_read_header(AVFormatContext *s) |
|
545 |
{
|
|
546 |
IPMVEContext *ipmovie = s->priv_data; |
|
547 |
AVIOContext *pb = s->pb; |
|
548 |
AVPacket pkt; |
|
549 |
AVStream *st; |
|
550 |
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE]; |
|
551 |
int chunk_type, i; |
|
552 |
uint8_t signature_buffer[sizeof(signature)]; |
|
553 |
||
554 |
avio_read(pb, signature_buffer, sizeof(signature_buffer)); |
|
555 |
while (memcmp(signature_buffer, signature, sizeof(signature))) { |
|
556 |
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1); |
|
557 |
signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb); |
|
558 |
if (avio_feof(pb)) |
|
559 |
return AVERROR_EOF; |
|
560 |
}
|
|
561 |
/* initialize private context members */
|
|
562 |
ipmovie->video_pts = ipmovie->audio_frame_count = 0; |
|
563 |
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset = |
|
564 |
ipmovie->decode_map_chunk_offset = 0; |
|
565 |
||
566 |
/* on the first read, this will position the stream at the first chunk */
|
|
567 |
ipmovie->next_chunk_offset = avio_tell(pb) + 4; |
|
568 |
||
569 |
for (i = 0; i < 256; i++) |
|
570 |
ipmovie->palette[i] = 0xFFU << 24; |
|
571 |
||
572 |
/* process the first chunk which should be CHUNK_INIT_VIDEO */
|
|
573 |
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO) |
|
574 |
return AVERROR_INVALIDDATA; |
|
575 |
||
576 |
/* peek ahead to the next chunk-- if it is an init audio chunk, process
|
|
577 |
* it; if it is the first video chunk, this is a silent file */
|
|
578 |
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) != |
|
579 |
CHUNK_PREAMBLE_SIZE) |
|
580 |
return AVERROR(EIO); |
|
581 |
chunk_type = AV_RL16(&chunk_preamble[2]); |
|
582 |
avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR); |
|
583 |
||
584 |
if (chunk_type == CHUNK_VIDEO) |
|
585 |
ipmovie->audio_type = AV_CODEC_ID_NONE; /* no audio */ |
|
586 |
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO) |
|
587 |
return AVERROR_INVALIDDATA; |
|
588 |
||
589 |
/* initialize the stream decoders */
|
|
590 |
st = avformat_new_stream(s, NULL); |
|
591 |
if (!st) |
|
592 |
return AVERROR(ENOMEM); |
|
593 |
avpriv_set_pts_info(st, 63, 1, 1000000); |
|
594 |
ipmovie->video_stream_index = st->index; |
|
595 |
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
596 |
st->codec->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO; |
|
597 |
st->codec->codec_tag = 0; /* no fourcc */ |
|
598 |
st->codec->width = ipmovie->video_width; |
|
599 |
st->codec->height = ipmovie->video_height; |
|
600 |
st->codec->bits_per_coded_sample = ipmovie->video_bpp; |
|
601 |
||
602 |
if (ipmovie->audio_type) { |
|
603 |
st = avformat_new_stream(s, NULL); |
|
604 |
if (!st) |
|
605 |
return AVERROR(ENOMEM); |
|
606 |
avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate); |
|
607 |
ipmovie->audio_stream_index = st->index; |
|
608 |
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
609 |
st->codec->codec_id = ipmovie->audio_type; |
|
610 |
st->codec->codec_tag = 0; /* no tag */ |
|
611 |
st->codec->channels = ipmovie->audio_channels; |
|
612 |
st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO : |
|
613 |
AV_CH_LAYOUT_STEREO; |
|
614 |
st->codec->sample_rate = ipmovie->audio_sample_rate; |
|
615 |
st->codec->bits_per_coded_sample = ipmovie->audio_bits; |
|
616 |
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
|
617 |
st->codec->bits_per_coded_sample; |
|
618 |
if (st->codec->codec_id == AV_CODEC_ID_INTERPLAY_DPCM) |
|
619 |
st->codec->bit_rate /= 2; |
|
620 |
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; |
|
621 |
}
|
|
622 |
||
623 |
return 0; |
|
624 |
}
|
|
625 |
||
626 |
static int ipmovie_read_packet(AVFormatContext *s, |
|
627 |
AVPacket *pkt) |
|
628 |
{
|
|
629 |
IPMVEContext *ipmovie = s->priv_data; |
|
630 |
AVIOContext *pb = s->pb; |
|
631 |
int ret; |
|
632 |
||
633 |
for (;;) { |
|
634 |
ret = process_ipmovie_chunk(ipmovie, pb, pkt); |
|
635 |
if (ret == CHUNK_BAD) |
|
636 |
ret = AVERROR_INVALIDDATA; |
|
637 |
else if (ret == CHUNK_EOF) |
|
638 |
ret = AVERROR(EIO); |
|
639 |
else if (ret == CHUNK_NOMEM) |
|
640 |
ret = AVERROR(ENOMEM); |
|
641 |
else if (ret == CHUNK_VIDEO) |
|
642 |
ret = 0; |
|
643 |
else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO) |
|
644 |
continue; |
|
645 |
else
|
|
646 |
ret = -1; |
|
647 |
||
648 |
return ret; |
|
649 |
}
|
|
650 |
}
|
|
651 |
||
652 |
AVInputFormat ff_ipmovie_demuxer = { |
|
653 |
.name = "ipmovie", |
|
654 |
.long_name = NULL_IF_CONFIG_SMALL("Interplay MVE"), |
|
655 |
.priv_data_size = sizeof(IPMVEContext), |
|
656 |
.read_probe = ipmovie_probe, |
|
657 |
.read_header = ipmovie_read_header, |
|
658 |
.read_packet = ipmovie_read_packet, |
|
659 |
};
|