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/common.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/log.h"
38 #include "libavutil/base64.h"
42 /* libtheora includes */
43 #include <theora/theoraenc.h>
45 typedef struct TheoraContext {
55 /** Concatenate an ogg_packet into the extradata. */
56 static int concatenate_packet(unsigned int* offset,
57 AVCodecContext* avc_context,
58 const ogg_packet* packet)
60 const char* message = NULL;
61 int newsize = avc_context->extradata_size + 2 + packet->bytes;
62 int err = AVERROR_INVALIDDATA;
64 if (packet->bytes < 0) {
65 message = "ogg_packet has negative size";
66 } else if (packet->bytes > 0xffff) {
67 message = "ogg_packet is larger than 65535 bytes";
68 } else if (newsize < avc_context->extradata_size) {
69 message = "extradata_size would overflow";
71 if ((err = av_reallocp(&avc_context->extradata, newsize)) < 0) {
72 avc_context->extradata_size = 0;
73 message = "av_realloc failed";
77 av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
81 avc_context->extradata_size = newsize;
82 AV_WB16(avc_context->extradata + (*offset), packet->bytes);
84 memcpy(avc_context->extradata + (*offset), packet->packet, packet->bytes);
85 (*offset) += packet->bytes;
89 static int get_stats(AVCodecContext *avctx, int eos)
91 #ifdef TH_ENCCTL_2PASS_OUT
92 TheoraContext *h = avctx->priv_data;
96 bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_OUT, &buf, sizeof(buf));
98 av_log(avctx, AV_LOG_ERROR, "Error getting first pass stats\n");
99 return AVERROR_EXTERNAL;
102 void *tmp = av_fast_realloc(h->stats, &h->stats_size,
103 h->stats_offset + bytes);
105 return AVERROR(ENOMEM);
107 memcpy(h->stats + h->stats_offset, buf, bytes);
108 h->stats_offset += bytes;
110 int b64_size = AV_BASE64_SIZE(h->stats_offset);
111 // libtheora generates a summary header at the end
112 memcpy(h->stats, buf, bytes);
113 avctx->stats_out = av_malloc(b64_size);
114 if (!avctx->stats_out)
115 return AVERROR(ENOMEM);
116 av_base64_encode(avctx->stats_out, b64_size, h->stats, h->stats_offset);
120 av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
121 return AVERROR(ENOSUP);
125 // libtheora won't read the entire buffer we give it at once, so we have to
126 // repeatedly submit it...
127 static int submit_stats(AVCodecContext *avctx)
129 #ifdef TH_ENCCTL_2PASS_IN
130 TheoraContext *h = avctx->priv_data;
133 if (!avctx->stats_in) {
134 av_log(avctx, AV_LOG_ERROR, "No statsfile for second pass\n");
135 return AVERROR(EINVAL);
137 h->stats_size = strlen(avctx->stats_in) * 3/4;
138 h->stats = av_malloc(h->stats_size);
141 return AVERROR(ENOMEM);
143 h->stats_size = av_base64_decode(h->stats, avctx->stats_in, h->stats_size);
145 while (h->stats_size - h->stats_offset > 0) {
146 bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_IN,
147 h->stats + h->stats_offset,
148 h->stats_size - h->stats_offset);
150 av_log(avctx, AV_LOG_ERROR, "Error submitting stats\n");
151 return AVERROR_EXTERNAL;
155 h->stats_offset += bytes;
159 av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
160 return AVERROR(ENOSUP);
164 static av_cold int encode_init(AVCodecContext* avc_context)
167 th_comment t_comment;
170 TheoraContext *h = avc_context->priv_data;
171 uint32_t gop_size = avc_context->gop_size;
174 /* Set up the theora_info struct */
175 th_info_init(&t_info);
176 t_info.frame_width = FFALIGN(avc_context->width, 16);
177 t_info.frame_height = FFALIGN(avc_context->height, 16);
178 t_info.pic_width = avc_context->width;
179 t_info.pic_height = avc_context->height;
182 /* Swap numerator and denominator as time_base in AVCodecContext gives the
183 * time period between frames, but theora_info needs the framerate. */
184 t_info.fps_numerator = avc_context->time_base.den;
185 t_info.fps_denominator = avc_context->time_base.num;
186 if (avc_context->sample_aspect_ratio.num) {
187 t_info.aspect_numerator = avc_context->sample_aspect_ratio.num;
188 t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
190 t_info.aspect_numerator = 1;
191 t_info.aspect_denominator = 1;
194 if (avc_context->color_primaries == AVCOL_PRI_BT470M)
195 t_info.colorspace = TH_CS_ITU_REC_470M;
196 else if (avc_context->color_primaries == AVCOL_PRI_BT470BG)
197 t_info.colorspace = TH_CS_ITU_REC_470BG;
199 t_info.colorspace = TH_CS_UNSPECIFIED;
201 if (avc_context->pix_fmt == AV_PIX_FMT_YUV420P)
202 t_info.pixel_fmt = TH_PF_420;
203 else if (avc_context->pix_fmt == AV_PIX_FMT_YUV422P)
204 t_info.pixel_fmt = TH_PF_422;
205 else if (avc_context->pix_fmt == AV_PIX_FMT_YUV444P)
206 t_info.pixel_fmt = TH_PF_444;
208 av_log(avc_context, AV_LOG_ERROR, "Unsupported pix_fmt\n");
209 return AVERROR(EINVAL);
211 ret = av_pix_fmt_get_chroma_sub_sample(avc_context->pix_fmt, &h->uv_hshift, &h->uv_vshift);
215 if (avc_context->flags & AV_CODEC_FLAG_QSCALE) {
216 /* Clip global_quality in QP units to the [0 - 10] range
217 to be consistent with the libvorbis implementation.
218 Theora accepts a quality parameter which is an int value in
221 t_info.quality = av_clipf(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
222 t_info.target_bitrate = 0;
224 t_info.target_bitrate = avc_context->bit_rate;
228 /* Now initialise libtheora */
229 h->t_state = th_encode_alloc(&t_info);
231 av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
232 return AVERROR_EXTERNAL;
235 h->keyframe_mask = (1 << t_info.keyframe_granule_shift) - 1;
236 /* Clear up theora_info struct */
237 th_info_clear(&t_info);
239 if (th_encode_ctl(h->t_state, TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
240 &gop_size, sizeof(gop_size))) {
241 av_log(avc_context, AV_LOG_ERROR, "Error setting GOP size\n");
242 return AVERROR_EXTERNAL;
245 // need to enable 2 pass (via TH_ENCCTL_2PASS_) before encoding headers
246 if (avc_context->flags & AV_CODEC_FLAG_PASS1) {
247 if ((ret = get_stats(avc_context, 0)) < 0)
249 } else if (avc_context->flags & AV_CODEC_FLAG_PASS2) {
250 if ((ret = submit_stats(avc_context)) < 0)
255 Output first header packet consisting of theora
256 header, comment, and tables.
258 Each one is prefixed with a 16-bit size, then they
259 are concatenated together into libavcodec's extradata.
264 th_comment_init(&t_comment);
266 while (th_encode_flushheader(h->t_state, &t_comment, &o_packet))
267 if ((ret = concatenate_packet(&offset, avc_context, &o_packet)) < 0)
270 th_comment_clear(&t_comment);
275 static int encode_frame(AVCodecContext* avc_context, AVPacket *pkt,
276 const AVFrame *frame, int *got_packet)
278 th_ycbcr_buffer t_yuv_buffer;
279 TheoraContext *h = avc_context->priv_data;
283 // EOS, finish and get 1st pass stats if applicable
285 th_encode_packetout(h->t_state, 1, &o_packet);
286 if (avc_context->flags & AV_CODEC_FLAG_PASS1)
287 if ((ret = get_stats(avc_context, 1)) < 0)
292 /* Copy planes to the theora yuv_buffer */
293 for (i = 0; i < 3; i++) {
294 t_yuv_buffer[i].width = FFALIGN(avc_context->width, 16) >> (i && h->uv_hshift);
295 t_yuv_buffer[i].height = FFALIGN(avc_context->height, 16) >> (i && h->uv_vshift);
296 t_yuv_buffer[i].stride = frame->linesize[i];
297 t_yuv_buffer[i].data = frame->data[i];
300 if (avc_context->flags & AV_CODEC_FLAG_PASS2)
301 if ((ret = submit_stats(avc_context)) < 0)
304 /* Now call into theora_encode_YUVin */
305 result = th_encode_ycbcr_in(h->t_state, t_yuv_buffer);
310 message = "differing frame sizes";
313 message = "encoder is not ready or is finished";
316 message = "unknown reason";
319 av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
320 return AVERROR_EXTERNAL;
323 if (avc_context->flags & AV_CODEC_FLAG_PASS1)
324 if ((ret = get_stats(avc_context, 0)) < 0)
327 /* Pick up returned ogg_packet */
328 result = th_encode_packetout(h->t_state, 0, &o_packet);
331 /* No packet is ready */
334 /* Success, we have a packet */
337 av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
338 return AVERROR_EXTERNAL;
341 /* Copy ogg_packet content out to buffer */
342 if ((ret = ff_alloc_packet2(avc_context, pkt, o_packet.bytes, 0)) < 0)
344 memcpy(pkt->data, o_packet.packet, o_packet.bytes);
346 // HACK: assumes no encoder delay, this is true until libtheora becomes
347 // multithreaded (which will be disabled unless explicitly requested)
348 pkt->pts = pkt->dts = frame->pts;
349 #if FF_API_CODED_FRAME
350 FF_DISABLE_DEPRECATION_WARNINGS
351 avc_context->coded_frame->key_frame = !(o_packet.granulepos & h->keyframe_mask);
352 FF_ENABLE_DEPRECATION_WARNINGS
354 if (!(o_packet.granulepos & h->keyframe_mask))
355 pkt->flags |= AV_PKT_FLAG_KEY;
361 static av_cold int encode_close(AVCodecContext* avc_context)
363 TheoraContext *h = avc_context->priv_data;
365 th_encode_free(h->t_state);
367 av_freep(&avc_context->stats_out);
368 av_freep(&avc_context->extradata);
369 avc_context->extradata_size = 0;
374 /** AVCodec struct exposed to libavcodec */
375 AVCodec ff_libtheora_encoder = {
377 .long_name = NULL_IF_CONFIG_SMALL("libtheora Theora"),
378 .type = AVMEDIA_TYPE_VIDEO,
379 .id = AV_CODEC_ID_THEORA,
380 .priv_data_size = sizeof(TheoraContext),
382 .close = encode_close,
383 .encode2 = encode_frame,
384 .capabilities = AV_CODEC_CAP_DELAY, // needed to get the statsfile summary
385 .pix_fmts = (const enum AVPixelFormat[]){
386 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE
388 .wrapper_name = "libtheora",