2
* Copyright (c) 2006 Paul Richards <paul.richards@gmail.com>
4
* This file is part of FFmpeg.
6
* FFmpeg is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
11
* FFmpeg is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with FFmpeg; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23
* @brief Theora encoder using libtheora.
24
* @author Paul Richards <paul.richards@gmail.com>
26
* A lot of this is copy / paste from other output codecs in
27
* libavcodec or pure guesswork (or both).
29
* I have used t_ prefixes on variables which are libtheora types
30
* and o_ prefixes on variables which are libogg types.
34
#include "libavutil/intreadwrite.h"
35
#include "libavutil/log.h"
36
#include "libavutil/base64.h"
39
/* libtheora includes */
40
#include <theora/theoraenc.h>
42
typedef struct TheoraContext {
52
/** Concatenates an ogg_packet into the extradata. */
53
static int concatenate_packet(unsigned int* offset,
54
AVCodecContext* avc_context,
55
const ogg_packet* packet)
57
const char* message = NULL;
58
uint8_t* newdata = NULL;
59
int newsize = avc_context->extradata_size + 2 + packet->bytes;
61
if (packet->bytes < 0) {
62
message = "ogg_packet has negative size";
63
} else if (packet->bytes > 0xffff) {
64
message = "ogg_packet is larger than 65535 bytes";
65
} else if (newsize < avc_context->extradata_size) {
66
message = "extradata_size would overflow";
68
newdata = av_realloc(avc_context->extradata, newsize);
70
message = "av_realloc failed";
73
av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
77
avc_context->extradata = newdata;
78
avc_context->extradata_size = newsize;
79
AV_WB16(avc_context->extradata + (*offset), packet->bytes);
81
memcpy(avc_context->extradata + (*offset), packet->packet, packet->bytes);
82
(*offset) += packet->bytes;
86
static int get_stats(AVCodecContext *avctx, int eos)
88
#ifdef TH_ENCCTL_2PASS_OUT
89
TheoraContext *h = avctx->priv_data;
93
bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_OUT, &buf, sizeof(buf));
95
av_log(avctx, AV_LOG_ERROR, "Error getting first pass stats\n");
99
h->stats = av_fast_realloc(h->stats, &h->stats_size,
100
h->stats_offset + bytes);
101
memcpy(h->stats + h->stats_offset, buf, bytes);
102
h->stats_offset += bytes;
104
int b64_size = ((h->stats_offset + 2) / 3) * 4 + 1;
105
// libtheora generates a summary header at the end
106
memcpy(h->stats, buf, bytes);
107
avctx->stats_out = av_malloc(b64_size);
108
av_base64_encode(avctx->stats_out, b64_size, h->stats, h->stats_offset);
112
av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
117
// libtheora won't read the entire buffer we give it at once, so we have to
118
// repeatedly submit it...
119
static int submit_stats(AVCodecContext *avctx)
121
#ifdef TH_ENCCTL_2PASS_IN
122
TheoraContext *h = avctx->priv_data;
125
if (!avctx->stats_in) {
126
av_log(avctx, AV_LOG_ERROR, "No statsfile for second pass\n");
129
h->stats_size = strlen(avctx->stats_in) * 3/4;
130
h->stats = av_malloc(h->stats_size);
131
h->stats_size = av_base64_decode(h->stats, avctx->stats_in, h->stats_size);
133
while (h->stats_size - h->stats_offset > 0) {
134
bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_IN,
135
h->stats + h->stats_offset,
136
h->stats_size - h->stats_offset);
138
av_log(avctx, AV_LOG_ERROR, "Error submitting stats\n");
143
h->stats_offset += bytes;
147
av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
152
static av_cold int encode_init(AVCodecContext* avc_context)
155
th_comment t_comment;
158
TheoraContext *h = avc_context->priv_data;
159
uint32_t gop_size = avc_context->gop_size;
161
/* Set up the theora_info struct */
162
th_info_init(&t_info);
163
t_info.frame_width = FFALIGN(avc_context->width, 16);
164
t_info.frame_height = FFALIGN(avc_context->height, 16);
165
t_info.pic_width = avc_context->width;
166
t_info.pic_height = avc_context->height;
169
/* Swap numerator and denominator as time_base in AVCodecContext gives the
170
* time period between frames, but theora_info needs the framerate. */
171
t_info.fps_numerator = avc_context->time_base.den;
172
t_info.fps_denominator = avc_context->time_base.num;
173
if (avc_context->sample_aspect_ratio.num) {
174
t_info.aspect_numerator = avc_context->sample_aspect_ratio.num;
175
t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
177
t_info.aspect_numerator = 1;
178
t_info.aspect_denominator = 1;
181
if (avc_context->color_primaries == AVCOL_PRI_BT470M)
182
t_info.colorspace = TH_CS_ITU_REC_470M;
183
else if (avc_context->color_primaries == AVCOL_PRI_BT470BG)
184
t_info.colorspace = TH_CS_ITU_REC_470BG;
186
t_info.colorspace = TH_CS_UNSPECIFIED;
188
if (avc_context->pix_fmt == PIX_FMT_YUV420P)
189
t_info.pixel_fmt = TH_PF_420;
190
else if (avc_context->pix_fmt == PIX_FMT_YUV422P)
191
t_info.pixel_fmt = TH_PF_422;
192
else if (avc_context->pix_fmt == PIX_FMT_YUV444P)
193
t_info.pixel_fmt = TH_PF_444;
195
av_log(avc_context, AV_LOG_ERROR, "Unsupported pix_fmt\n");
198
avcodec_get_chroma_sub_sample(avc_context->pix_fmt, &h->uv_hshift, &h->uv_vshift);
200
if (avc_context->flags & CODEC_FLAG_QSCALE) {
201
/* to be constant with the libvorbis implementation, clip global_quality to 0 - 10
202
Theora accepts a quality parameter p, which is:
206
t_info.quality = av_clip(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
207
t_info.target_bitrate = 0;
209
t_info.target_bitrate = avc_context->bit_rate;
213
/* Now initialise libtheora */
214
h->t_state = th_encode_alloc(&t_info);
216
av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
220
h->keyframe_mask = (1 << t_info.keyframe_granule_shift) - 1;
221
/* Clear up theora_info struct */
222
th_info_clear(&t_info);
224
if (th_encode_ctl(h->t_state, TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
225
&gop_size, sizeof(gop_size))) {
226
av_log(avc_context, AV_LOG_ERROR, "Error setting GOP size\n");
230
// need to enable 2 pass (via TH_ENCCTL_2PASS_) before encoding headers
231
if (avc_context->flags & CODEC_FLAG_PASS1) {
232
if (get_stats(avc_context, 0))
234
} else if (avc_context->flags & CODEC_FLAG_PASS2) {
235
if (submit_stats(avc_context))
240
Output first header packet consisting of theora
241
header, comment, and tables.
243
Each one is prefixed with a 16bit size, then they
244
are concatenated together into ffmpeg's extradata.
249
th_comment_init(&t_comment);
251
while (th_encode_flushheader(h->t_state, &t_comment, &o_packet))
252
if (concatenate_packet(&offset, avc_context, &o_packet))
255
th_comment_clear(&t_comment);
257
/* Set up the output AVFrame */
258
avc_context->coded_frame= avcodec_alloc_frame();
263
static int encode_frame(AVCodecContext* avc_context, uint8_t *outbuf,
264
int buf_size, void *data)
266
th_ycbcr_buffer t_yuv_buffer;
267
TheoraContext *h = avc_context->priv_data;
268
AVFrame *frame = data;
272
// EOS, finish and get 1st pass stats if applicable
274
th_encode_packetout(h->t_state, 1, &o_packet);
275
if (avc_context->flags & CODEC_FLAG_PASS1)
276
if (get_stats(avc_context, 1))
281
/* Copy planes to the theora yuv_buffer */
282
for (i = 0; i < 3; i++) {
283
t_yuv_buffer[i].width = FFALIGN(avc_context->width, 16) >> (i && h->uv_hshift);
284
t_yuv_buffer[i].height = FFALIGN(avc_context->height, 16) >> (i && h->uv_vshift);
285
t_yuv_buffer[i].stride = frame->linesize[i];
286
t_yuv_buffer[i].data = frame->data[i];
289
if (avc_context->flags & CODEC_FLAG_PASS2)
290
if (submit_stats(avc_context))
293
/* Now call into theora_encode_YUVin */
294
result = th_encode_ycbcr_in(h->t_state, t_yuv_buffer);
299
message = "differing frame sizes";
302
message = "encoder is not ready or is finished";
305
message = "unknown reason";
308
av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
312
if (avc_context->flags & CODEC_FLAG_PASS1)
313
if (get_stats(avc_context, 0))
316
/* Pick up returned ogg_packet */
317
result = th_encode_packetout(h->t_state, 0, &o_packet);
320
/* No packet is ready */
323
/* Success, we have a packet */
326
av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
330
/* Copy ogg_packet content out to buffer */
331
if (buf_size < o_packet.bytes) {
332
av_log(avc_context, AV_LOG_ERROR, "encoded frame too large\n");
335
memcpy(outbuf, o_packet.packet, o_packet.bytes);
337
// HACK: assumes no encoder delay, this is true until libtheora becomes
338
// multithreaded (which will be disabled unless explictly requested)
339
avc_context->coded_frame->pts = frame->pts;
340
avc_context->coded_frame->key_frame = !(o_packet.granulepos & h->keyframe_mask);
342
return o_packet.bytes;
345
static av_cold int encode_close(AVCodecContext* avc_context)
347
TheoraContext *h = avc_context->priv_data;
349
th_encode_free(h->t_state);
351
av_freep(&avc_context->coded_frame);
352
av_freep(&avc_context->stats_out);
353
av_freep(&avc_context->extradata);
354
avc_context->extradata_size = 0;
359
/** AVCodec struct exposed to libavcodec */
360
AVCodec libtheora_encoder = {
362
.type = AVMEDIA_TYPE_VIDEO,
363
.id = CODEC_ID_THEORA,
364
.priv_data_size = sizeof(TheoraContext),
366
.close = encode_close,
367
.encode = encode_frame,
368
.capabilities = CODEC_CAP_DELAY, // needed to get the statsfile summary
369
.pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
370
.long_name = NULL_IF_CONFIG_SMALL("libtheora Theora"),