/*
- * copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2001 Fabrice Bellard
*
- * This file is part of Libav.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
*
- * Libav 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.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
*/
/**
AVFrame *frame;
AVPacket pkt;
int i, j, k, ret, got_output;
- int buffer_size;
FILE *f;
uint16_t *samples;
float t, tincr;
/* find the MP2 encoder */
codec = avcodec_find_encoder(AV_CODEC_ID_MP2);
if (!codec) {
- fprintf(stderr, "codec not found\n");
+ fprintf(stderr, "Codec not found\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
+ if (!c) {
+ fprintf(stderr, "Could not allocate audio codec context\n");
+ exit(1);
+ }
/* put sample parameters */
c->bit_rate = 64000;
/* check that the encoder supports s16 pcm input */
c->sample_fmt = AV_SAMPLE_FMT_S16;
if (!check_sample_fmt(codec, c->sample_fmt)) {
- fprintf(stderr, "encoder does not support %s",
+ fprintf(stderr, "Encoder does not support sample format %s",
av_get_sample_fmt_name(c->sample_fmt));
exit(1);
}
/* open it */
if (avcodec_open2(c, codec, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
+ fprintf(stderr, "Could not open codec\n");
exit(1);
}
f = fopen(filename, "wb");
if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
+ fprintf(stderr, "Could not open %s\n", filename);
exit(1);
}
/* frame containing input raw audio */
frame = av_frame_alloc();
if (!frame) {
- fprintf(stderr, "could not allocate audio frame\n");
+ fprintf(stderr, "Could not allocate audio frame\n");
exit(1);
}
frame->format = c->sample_fmt;
frame->channel_layout = c->channel_layout;
- /* the codec gives us the frame size, in samples,
- * we calculate the size of the samples buffer in bytes */
- buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size,
- c->sample_fmt, 0);
- if (buffer_size < 0) {
- fprintf(stderr, "Could not get sample buffer size\n");
- exit(1);
- }
- samples = av_malloc(buffer_size);
- if (!samples) {
- fprintf(stderr, "Could not allocate %d bytes for samples buffer\n",
- buffer_size);
- exit(1);
- }
- /* setup the data pointers in the AVFrame */
- ret = avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
- (const uint8_t*)samples, buffer_size, 0);
+ /* allocate the data buffers */
+ ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
- fprintf(stderr, "Could not setup audio frame\n");
- fprintf(stderr, "could not allocate audio data buffers\n");
++ fprintf(stderr, "Could not allocate audio data buffers\n");
exit(1);
}
/* encode a single tone sound */
t = 0;
tincr = 2 * M_PI * 440.0 / c->sample_rate;
- for(i=0;i<200;i++) {
+ for (i = 0; i < 200; i++) {
av_init_packet(&pkt);
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
+ /* make sure the frame is writable -- makes a copy if the encoder
+ * kept a reference internally */
+ ret = av_frame_make_writable(frame);
+ if (ret < 0)
+ exit(1);
+ samples = (uint16_t*)frame->data[0];
+
for (j = 0; j < c->frame_size; j++) {
samples[2*j] = (int)(sin(t) * 10000);
/* encode the samples */
ret = avcodec_encode_audio2(c, &pkt, frame, &got_output);
if (ret < 0) {
- fprintf(stderr, "error encoding audio frame\n");
+ fprintf(stderr, "Error encoding audio frame\n");
exit(1);
}
if (got_output) {
av_packet_unref(&pkt);
}
}
+
+ /* get the delayed frames */
+ for (got_output = 1; got_output; i++) {
+ ret = avcodec_encode_audio2(c, &pkt, NULL, &got_output);
+ if (ret < 0) {
+ fprintf(stderr, "Error encoding frame\n");
+ exit(1);
+ }
+
+ if (got_output) {
+ fwrite(pkt.data, 1, pkt.size, f);
+ av_packet_unref(&pkt);
+ }
+ }
fclose(f);
- av_freep(&samples);
av_frame_free(&frame);
avcodec_free_context(&c);
}
projects / ffmpeg.git / commitdiff