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[libav.git] / libavcodec / libtheoraenc.c
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1/*
2 * Copyright (c) 2006 Paul Richards <paul.richards@gmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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 St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/*!
22 * \file theoraenc.c
23 * \brief Theora encoder using libtheora.
24 * \author Paul Richards <paul.richards@gmail.com>
25 *
26 * A lot of this is copy / paste from other output codecs in
27 * libavcodec or pure guesswork (or both).
28 *
29 * I have used t_ prefixes on variables which are libtheora types
30 * and o_ prefixes on variables which are libogg types.
31 */
32
33/* FFmpeg includes */
34#include "avcodec.h"
35#include "log.h"
36
37/* libtheora includes */
38#include <theora/theora.h>
39
40typedef struct TheoraContext{
41 theora_state t_state;
42} TheoraContext;
43
44/*!
45 Concatenates an ogg_packet into the extradata.
46*/
47static int concatenate_packet(unsigned int* offset, AVCodecContext* avc_context, const ogg_packet* packet)
48{
49 char* message = NULL;
50 uint8_t* newdata = NULL;
51 int newsize = avc_context->extradata_size + 2 + packet->bytes;
52
53 if (packet->bytes < 0) {
54 message = "ogg_packet has negative size";
55 } else if (packet->bytes > 0xffff) {
56 message = "ogg_packet is larger than 65535 bytes";
57 } else if (newsize < avc_context->extradata_size) {
58 message = "extradata_size would overflow";
59 } else {
60 newdata = av_realloc(avc_context->extradata, newsize);
61 if (newdata == NULL) {
62 message = "av_realloc failed";
63 }
64 }
65 if (message != NULL) {
66 av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
67 return -1;
68 }
69
70 avc_context->extradata = newdata;
71 avc_context->extradata_size = newsize;
72 avc_context->extradata[ (*offset)++ ] = packet->bytes >> 8;
73 avc_context->extradata[ (*offset)++ ] = packet->bytes & 0xff;
74 memcpy( avc_context->extradata + (*offset), packet->packet, packet->bytes );
75 (*offset) += packet->bytes;
76 return 0;
77}
78
79static int encode_init(AVCodecContext* avc_context)
80{
81 theora_info t_info;
82 theora_comment t_comment;
83 ogg_packet o_packet;
84 unsigned int offset;
85 TheoraContext *h = avc_context->priv_data;
86
87 /* Set up the theora_info struct */
88 theora_info_init( &t_info );
89 t_info.width = avc_context->width;
90 t_info.height = avc_context->height;
91 t_info.frame_width = avc_context->width;
92 t_info.frame_height = avc_context->height;
93 t_info.offset_x = 0;
94 t_info.offset_y = 0;
95 t_info.fps_numerator = avc_context->time_base.den;
96 t_info.fps_denominator = avc_context->time_base.num;
97 if (avc_context->sample_aspect_ratio.num != 0) {
98 t_info.aspect_numerator = avc_context->sample_aspect_ratio.num;
99 t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
100 } else {
101 t_info.aspect_numerator = 1;
102 t_info.aspect_denominator = 1;
103 }
104 t_info.colorspace = OC_CS_UNSPECIFIED;
105 t_info.pixelformat = OC_PF_420;
106 t_info.target_bitrate = avc_context->bit_rate;
107 t_info.keyframe_frequency = avc_context->gop_size;
108 t_info.keyframe_frequency_force = avc_context->gop_size;
109 t_info.keyframe_mindistance = avc_context->keyint_min;
110 t_info.quality = 0;
111
112 t_info.quick_p = 1;
113 t_info.dropframes_p = 0;
114 t_info.keyframe_auto_p = 1;
115 t_info.keyframe_data_target_bitrate = t_info.target_bitrate * 1.5;
116 t_info.keyframe_auto_threshold = 80;
117 t_info.noise_sensitivity = 1;
118 t_info.sharpness = 0;
119
120 /* Now initialise libtheora */
121 if (theora_encode_init( &(h->t_state), &t_info ) != 0) {
122 av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
123 return -1;
124 }
125
126 /* Clear up theora_info struct */
127 theora_info_clear( &t_info );
128
129 /*
130 Output first header packet consisting of theora
131 header, comment, and tables.
132
133 Each one is prefixed with a 16bit size, then they
134 are concatenated together into ffmpeg's extradata.
135 */
136 offset = 0;
137
138 /* Header */
139 theora_encode_header( &(h->t_state), &o_packet );
140 if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) {
141 return -1;
142 }
143
144 /* Comment */
145 theora_comment_init( &t_comment );
146 theora_encode_comment( &t_comment, &o_packet );
147 if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) {
148 return -1;
149 }
150
151 /* Tables */
152 theora_encode_tables( &(h->t_state), &o_packet );
153 if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) {
154 return -1;
155 }
156
157 /* Clear up theora_comment struct */
158 theora_comment_clear( &t_comment );
159
160 /* Set up the output AVFrame */
161 avc_context->coded_frame= avcodec_alloc_frame();
162
163 return 0;
164}
165
166static int encode_frame(
167 AVCodecContext* avc_context,
168 uint8_t *outbuf,
169 int buf_size,
170 void *data)
171{
172 yuv_buffer t_yuv_buffer;
173 TheoraContext *h = avc_context->priv_data;
174 AVFrame *frame = data;
175 ogg_packet o_packet;
176 int result;
177
178 assert(avc_context->pix_fmt == PIX_FMT_YUV420P);
179
180 /* Copy planes to the theora yuv_buffer */
181 if (frame->linesize[1] != frame->linesize[2]) {
182 av_log(avc_context, AV_LOG_ERROR, "U and V stride differ\n");
183 return -1;
184 }
185
186 t_yuv_buffer.y_width = avc_context->width;
187 t_yuv_buffer.y_height = avc_context->height;
188 t_yuv_buffer.y_stride = frame->linesize[0];
189 t_yuv_buffer.uv_width = t_yuv_buffer.y_width / 2;
190 t_yuv_buffer.uv_height = t_yuv_buffer.y_height / 2;
191 t_yuv_buffer.uv_stride = frame->linesize[1];
192
193 t_yuv_buffer.y = frame->data[0];
194 t_yuv_buffer.u = frame->data[1];
195 t_yuv_buffer.v = frame->data[2];
196
197 /* Now call into theora_encode_YUVin */
198 result = theora_encode_YUVin( &(h->t_state), &t_yuv_buffer );
199 if (result != 0) {
200 const char* message;
201 switch (result) {
202 case -1:
203 message = "differing frame sizes";
204 break;
205 case OC_EINVAL:
206 message = "encoder is not ready or is finished";
207 break;
208 default:
209 message = "unknown reason";
210 break;
211 }
212 av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
213 return -1;
214 }
215
216 /* Pick up returned ogg_packet */
217 result = theora_encode_packetout( &(h->t_state), 0, &o_packet );
218 switch (result) {
219 case 0:
220 /* No packet is ready */
221 return 0;
222 case 1:
223 /* Success, we have a packet */
224 break;
225 default:
226 av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
227 return -1;
228 }
229
230 /* Copy ogg_packet content out to buffer */
231 if (buf_size < o_packet.bytes) {
232 av_log(avc_context, AV_LOG_ERROR, "encoded frame too large\n");
233 return -1;
234 }
235 memcpy(outbuf, o_packet.packet, o_packet.bytes);
236
237 return o_packet.bytes;
238}
239
240static int encode_close(AVCodecContext* avc_context)
241{
242 ogg_packet o_packet;
243 TheoraContext *h = avc_context->priv_data;
244 int result;
245 const char* message;
246
247 result = theora_encode_packetout( &(h->t_state), 1, &o_packet );
248 theora_clear( &(h->t_state) );
249 switch (result) {
250 case 0:/* No packet is ready */
251 case -1:/* Encoding finished */
252 return 0;
253 case 1:
254 /* We have a packet */
255 message = "gave us a packet";
256 break;
257 default:
258 message = "unknown reason";
259 break;
260 }
261 av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed (%s) [%d]\n", message, result);
262 return -1;
263}
264
265static const enum PixelFormat supported_pixel_formats[] = { PIX_FMT_YUV420P, -1 };
266
267/*! AVCodec struct exposed to libavcodec */
268AVCodec libtheora_encoder =
269{
270 .name = "libtheora",
271 .type = CODEC_TYPE_VIDEO,
272 .id = CODEC_ID_THEORA,
273 .priv_data_size = sizeof(TheoraContext),
274 .init = encode_init,
275 .close = encode_close,
276 .encode = encode_frame,
277 .pix_fmts = supported_pixel_formats,
278};