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courtesy of Paul Richards, paul.richards gmail com Originally committed as revision 7698 to svn://svn.ffmpeg.org/ffmpeg/trunk
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,278 @@ | ||
| /* | ||
| * Copyright (c) 2006 Paul Richards <paul.richards@gmail.com> | ||
| * | ||
| * This file is part of FFmpeg. | ||
| * | ||
| * FFmpeg is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2.1 of the License, or (at your option) any later version. | ||
| * | ||
| * FFmpeg is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with FFmpeg; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
| */ | ||
|
|
||
| /*! | ||
| * \file theoraenc.c | ||
| * \brief Theora encoder using libtheora. | ||
| * \author Paul Richards <paul.richards@gmail.com> | ||
| * | ||
| * A lot of this is copy / paste from other output codecs in | ||
| * libavcodec or pure guesswork (or both). | ||
| * | ||
| * I have used t_ prefixes on variables which are libtheora types | ||
| * and o_ prefixes on variables which are libogg types. | ||
| */ | ||
|
|
||
| /* FFmpeg includes */ | ||
| #include "avcodec.h" | ||
| #include "log.h" | ||
|
|
||
| /* libtheora includes */ | ||
| #include <theora/theora.h> | ||
|
|
||
| typedef struct TheoraContext{ | ||
| theora_state t_state; | ||
| } TheoraContext; | ||
|
|
||
| /*! | ||
| Concatenates an ogg_packet into the extradata. | ||
| */ | ||
| static int concatenate_packet(unsigned int* offset, AVCodecContext* avc_context, const ogg_packet* packet) | ||
| { | ||
| char* message = NULL; | ||
| uint8_t* newdata = NULL; | ||
| int newsize = avc_context->extradata_size + 2 + packet->bytes; | ||
|
|
||
| if (packet->bytes < 0) { | ||
| message = "ogg_packet has negative size"; | ||
| } else if (packet->bytes > 0xffff) { | ||
| message = "ogg_packet is larger than 65535 bytes"; | ||
| } else if (newsize < avc_context->extradata_size) { | ||
| message = "extradata_size would overflow"; | ||
| } else { | ||
| newdata = av_realloc(avc_context->extradata, newsize); | ||
| if (newdata == NULL) { | ||
| message = "av_realloc failed"; | ||
| } | ||
| } | ||
| if (message != NULL) { | ||
| av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message); | ||
| return -1; | ||
| } | ||
|
|
||
| avc_context->extradata = newdata; | ||
| avc_context->extradata_size = newsize; | ||
| avc_context->extradata[ (*offset)++ ] = packet->bytes >> 8; | ||
| avc_context->extradata[ (*offset)++ ] = packet->bytes & 0xff; | ||
| memcpy( avc_context->extradata + (*offset), packet->packet, packet->bytes ); | ||
| (*offset) += packet->bytes; | ||
| return 0; | ||
| } | ||
|
|
||
| static int encode_init(AVCodecContext* avc_context) | ||
| { | ||
| theora_info t_info; | ||
| theora_comment t_comment; | ||
| ogg_packet o_packet; | ||
| unsigned int offset; | ||
| TheoraContext *h = avc_context->priv_data; | ||
|
|
||
| /* Set up the theora_info struct */ | ||
| theora_info_init( &t_info ); | ||
| t_info.width = avc_context->width; | ||
| t_info.height = avc_context->height; | ||
| t_info.frame_width = avc_context->width; | ||
| t_info.frame_height = avc_context->height; | ||
| t_info.offset_x = 0; | ||
| t_info.offset_y = 0; | ||
| t_info.fps_numerator = avc_context->time_base.den; | ||
| t_info.fps_denominator = avc_context->time_base.num; | ||
| if (avc_context->sample_aspect_ratio.num != 0) { | ||
| t_info.aspect_numerator = avc_context->sample_aspect_ratio.num; | ||
| t_info.aspect_denominator = avc_context->sample_aspect_ratio.den; | ||
| } else { | ||
| t_info.aspect_numerator = 1; | ||
| t_info.aspect_denominator = 1; | ||
| } | ||
| t_info.colorspace = OC_CS_UNSPECIFIED; | ||
| t_info.pixelformat = OC_PF_420; | ||
| t_info.target_bitrate = avc_context->bit_rate; | ||
| t_info.keyframe_frequency = avc_context->gop_size; | ||
| t_info.keyframe_frequency_force = avc_context->gop_size; | ||
| t_info.keyframe_mindistance = avc_context->keyint_min; | ||
| t_info.quality = 0; | ||
|
|
||
| t_info.quick_p = 1; | ||
| t_info.dropframes_p = 0; | ||
| t_info.keyframe_auto_p = 1; | ||
| t_info.keyframe_data_target_bitrate = t_info.target_bitrate * 1.5; | ||
| t_info.keyframe_auto_threshold = 80; | ||
| t_info.noise_sensitivity = 1; | ||
| t_info.sharpness = 0; | ||
|
|
||
| /* Now initialise libtheora */ | ||
| if (theora_encode_init( &(h->t_state), &t_info ) != 0) { | ||
| av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n"); | ||
| return -1; | ||
| } | ||
|
|
||
| /* Clear up theora_info struct */ | ||
| theora_info_clear( &t_info ); | ||
|
|
||
| /* | ||
| Output first header packet consisting of theora | ||
| header, comment, and tables. | ||
| Each one is prefixed with a 16bit size, then they | ||
| are concatenated together into ffmpeg's extradata. | ||
| */ | ||
| offset = 0; | ||
|
|
||
| /* Header */ | ||
| theora_encode_header( &(h->t_state), &o_packet ); | ||
| if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { | ||
| return -1; | ||
| } | ||
|
|
||
| /* Comment */ | ||
| theora_comment_init( &t_comment ); | ||
| theora_encode_comment( &t_comment, &o_packet ); | ||
| if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { | ||
| return -1; | ||
| } | ||
|
|
||
| /* Tables */ | ||
| theora_encode_tables( &(h->t_state), &o_packet ); | ||
| if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { | ||
| return -1; | ||
| } | ||
|
|
||
| /* Clear up theora_comment struct */ | ||
| theora_comment_clear( &t_comment ); | ||
|
|
||
| /* Set up the output AVFrame */ | ||
| avc_context->coded_frame= avcodec_alloc_frame(); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static int encode_frame( | ||
| AVCodecContext* avc_context, | ||
| uint8_t *outbuf, | ||
| int buf_size, | ||
| void *data) | ||
| { | ||
| yuv_buffer t_yuv_buffer; | ||
| TheoraContext *h = avc_context->priv_data; | ||
| AVFrame *frame = data; | ||
| ogg_packet o_packet; | ||
| int result; | ||
|
|
||
| assert(avc_context->pix_fmt == PIX_FMT_YUV420P); | ||
|
|
||
| /* Copy planes to the theora yuv_buffer */ | ||
| if (frame->linesize[1] != frame->linesize[2]) { | ||
| av_log(avc_context, AV_LOG_ERROR, "U and V stride differ\n"); | ||
| return -1; | ||
| } | ||
|
|
||
| t_yuv_buffer.y_width = avc_context->width; | ||
| t_yuv_buffer.y_height = avc_context->height; | ||
| t_yuv_buffer.y_stride = frame->linesize[0]; | ||
| t_yuv_buffer.uv_width = t_yuv_buffer.y_width / 2; | ||
| t_yuv_buffer.uv_height = t_yuv_buffer.y_height / 2; | ||
| t_yuv_buffer.uv_stride = frame->linesize[1]; | ||
|
|
||
| t_yuv_buffer.y = frame->data[0]; | ||
| t_yuv_buffer.u = frame->data[1]; | ||
| t_yuv_buffer.v = frame->data[2]; | ||
|
|
||
| /* Now call into theora_encode_YUVin */ | ||
| result = theora_encode_YUVin( &(h->t_state), &t_yuv_buffer ); | ||
| if (result != 0) { | ||
| const char* message; | ||
| switch (result) { | ||
| case -1: | ||
| message = "differing frame sizes"; | ||
| break; | ||
| case OC_EINVAL: | ||
| message = "encoder is not ready or is finished"; | ||
| break; | ||
| default: | ||
| message = "unknown reason"; | ||
| break; | ||
| } | ||
| av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result); | ||
| return -1; | ||
| } | ||
|
|
||
| /* Pick up returned ogg_packet */ | ||
| result = theora_encode_packetout( &(h->t_state), 0, &o_packet ); | ||
| switch (result) { | ||
| case 0: | ||
| /* No packet is ready */ | ||
| return 0; | ||
| case 1: | ||
| /* Success, we have a packet */ | ||
| break; | ||
| default: | ||
| av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result); | ||
| return -1; | ||
| } | ||
|
|
||
| /* Copy ogg_packet content out to buffer */ | ||
| if (buf_size < o_packet.bytes) { | ||
| av_log(avc_context, AV_LOG_ERROR, "encoded frame too large\n"); | ||
| return -1; | ||
| } | ||
| memcpy(outbuf, o_packet.packet, o_packet.bytes); | ||
|
|
||
| return o_packet.bytes; | ||
| } | ||
|
|
||
| static int encode_close(AVCodecContext* avc_context) | ||
| { | ||
| ogg_packet o_packet; | ||
| TheoraContext *h = avc_context->priv_data; | ||
| int result; | ||
| const char* message; | ||
|
|
||
| result = theora_encode_packetout( &(h->t_state), 1, &o_packet ); | ||
| theora_clear( &(h->t_state) ); | ||
| switch (result) { | ||
| case 0:/* No packet is ready */ | ||
| case -1:/* Encoding finished */ | ||
| return 0; | ||
| case 1: | ||
| /* We have a packet */ | ||
| message = "gave us a packet"; | ||
| break; | ||
| default: | ||
| message = "unknown reason"; | ||
| break; | ||
| } | ||
| av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed (%s) [%d]\n", message, result); | ||
| return -1; | ||
| } | ||
|
|
||
| static const enum PixelFormat supported_pixel_formats[] = { PIX_FMT_YUV420P, -1 }; | ||
|
|
||
| /*! AVCodec struct exposed to libavcodec */ | ||
| AVCodec libtheora_encoder = | ||
| { | ||
| .name = "libtheora", | ||
| .type = CODEC_TYPE_VIDEO, | ||
| .id = CODEC_ID_THEORA, | ||
| .priv_data_size = sizeof(TheoraContext), | ||
| .init = encode_init, | ||
| .close = encode_close, | ||
| .encode = encode_frame, | ||
| .pix_fmts = supported_pixel_formats, | ||
| }; |