00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021 #include "avformat.h"
00022
00023 #include <stdlib.h>
00024 #include <stdio.h>
00025 #include <string.h>
00026 #ifdef HAVE_SOUNDCARD_H
00027 #include <soundcard.h>
00028 #else
00029 #include <sys/soundcard.h>
00030 #endif
00031 #include <unistd.h>
00032 #include <fcntl.h>
00033 #include <sys/ioctl.h>
00034 #include <sys/mman.h>
00035 #include <sys/time.h>
00036
00037 #define AUDIO_BLOCK_SIZE 4096
00038
00039 typedef struct {
00040 int fd;
00041 int sample_rate;
00042 int channels;
00043 int frame_size;
00044 int codec_id;
00045 int flip_left : 1;
00046 uint8_t buffer[AUDIO_BLOCK_SIZE];
00047 int buffer_ptr;
00048 } AudioData;
00049
00050 static int audio_open(AudioData *s, int is_output, const char *audio_device)
00051 {
00052 int audio_fd;
00053 int tmp, err;
00054 char *flip = getenv("AUDIO_FLIP_LEFT");
00055
00056 if (is_output)
00057 audio_fd = open(audio_device, O_WRONLY);
00058 else
00059 audio_fd = open(audio_device, O_RDONLY);
00060 if (audio_fd < 0) {
00061 av_log(NULL, AV_LOG_ERROR, "%s: %s\n", audio_device, strerror(errno));
00062 return AVERROR(EIO);
00063 }
00064
00065 if (flip && *flip == '1') {
00066 s->flip_left = 1;
00067 }
00068
00069
00070 if (!is_output)
00071 fcntl(audio_fd, F_SETFL, O_NONBLOCK);
00072
00073 s->frame_size = AUDIO_BLOCK_SIZE;
00074 #if 0
00075 tmp = (NB_FRAGMENTS << 16) | FRAGMENT_BITS;
00076 err = ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &tmp);
00077 if (err < 0) {
00078 perror("SNDCTL_DSP_SETFRAGMENT");
00079 }
00080 #endif
00081
00082
00083 err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
00084
00085 #ifdef WORDS_BIGENDIAN
00086 if (tmp & AFMT_S16_BE) {
00087 tmp = AFMT_S16_BE;
00088 } else if (tmp & AFMT_S16_LE) {
00089 tmp = AFMT_S16_LE;
00090 } else {
00091 tmp = 0;
00092 }
00093 #else
00094 if (tmp & AFMT_S16_LE) {
00095 tmp = AFMT_S16_LE;
00096 } else if (tmp & AFMT_S16_BE) {
00097 tmp = AFMT_S16_BE;
00098 } else {
00099 tmp = 0;
00100 }
00101 #endif
00102
00103 switch(tmp) {
00104 case AFMT_S16_LE:
00105 s->codec_id = CODEC_ID_PCM_S16LE;
00106 break;
00107 case AFMT_S16_BE:
00108 s->codec_id = CODEC_ID_PCM_S16BE;
00109 break;
00110 default:
00111 av_log(NULL, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
00112 close(audio_fd);
00113 return AVERROR(EIO);
00114 }
00115 err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
00116 if (err < 0) {
00117 av_log(NULL, AV_LOG_ERROR, "SNDCTL_DSP_SETFMT: %s\n", strerror(errno));
00118 goto fail;
00119 }
00120
00121 tmp = (s->channels == 2);
00122 err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
00123 if (err < 0) {
00124 av_log(NULL, AV_LOG_ERROR, "SNDCTL_DSP_STEREO: %s\n", strerror(errno));
00125 goto fail;
00126 }
00127 if (tmp)
00128 s->channels = 2;
00129
00130 tmp = s->sample_rate;
00131 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
00132 if (err < 0) {
00133 av_log(NULL, AV_LOG_ERROR, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
00134 goto fail;
00135 }
00136 s->sample_rate = tmp;
00137 s->fd = audio_fd;
00138
00139 return 0;
00140 fail:
00141 close(audio_fd);
00142 return AVERROR(EIO);
00143 }
00144
00145 static int audio_close(AudioData *s)
00146 {
00147 close(s->fd);
00148 return 0;
00149 }
00150
00151
00152 static int audio_write_header(AVFormatContext *s1)
00153 {
00154 AudioData *s = s1->priv_data;
00155 AVStream *st;
00156 int ret;
00157
00158 st = s1->streams[0];
00159 s->sample_rate = st->codec->sample_rate;
00160 s->channels = st->codec->channels;
00161 ret = audio_open(s, 1, s1->filename);
00162 if (ret < 0) {
00163 return AVERROR(EIO);
00164 } else {
00165 return 0;
00166 }
00167 }
00168
00169 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
00170 {
00171 AudioData *s = s1->priv_data;
00172 int len, ret;
00173 int size= pkt->size;
00174 uint8_t *buf= pkt->data;
00175
00176 while (size > 0) {
00177 len = AUDIO_BLOCK_SIZE - s->buffer_ptr;
00178 if (len > size)
00179 len = size;
00180 memcpy(s->buffer + s->buffer_ptr, buf, len);
00181 s->buffer_ptr += len;
00182 if (s->buffer_ptr >= AUDIO_BLOCK_SIZE) {
00183 for(;;) {
00184 ret = write(s->fd, s->buffer, AUDIO_BLOCK_SIZE);
00185 if (ret > 0)
00186 break;
00187 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
00188 return AVERROR(EIO);
00189 }
00190 s->buffer_ptr = 0;
00191 }
00192 buf += len;
00193 size -= len;
00194 }
00195 return 0;
00196 }
00197
00198 static int audio_write_trailer(AVFormatContext *s1)
00199 {
00200 AudioData *s = s1->priv_data;
00201
00202 audio_close(s);
00203 return 0;
00204 }
00205
00206
00207
00208 static int audio_read_header(AVFormatContext *s1, AVFormatParameters *ap)
00209 {
00210 AudioData *s = s1->priv_data;
00211 AVStream *st;
00212 int ret;
00213
00214 if (ap->sample_rate <= 0 || ap->channels <= 0)
00215 return -1;
00216
00217 st = av_new_stream(s1, 0);
00218 if (!st) {
00219 return AVERROR(ENOMEM);
00220 }
00221 s->sample_rate = ap->sample_rate;
00222 s->channels = ap->channels;
00223
00224 ret = audio_open(s, 0, s1->filename);
00225 if (ret < 0) {
00226 av_free(st);
00227 return AVERROR(EIO);
00228 }
00229
00230
00231 st->codec->codec_type = CODEC_TYPE_AUDIO;
00232 st->codec->codec_id = s->codec_id;
00233 st->codec->sample_rate = s->sample_rate;
00234 st->codec->channels = s->channels;
00235
00236 av_set_pts_info(st, 64, 1, 1000000);
00237 return 0;
00238 }
00239
00240 static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
00241 {
00242 AudioData *s = s1->priv_data;
00243 int ret, bdelay;
00244 int64_t cur_time;
00245 struct audio_buf_info abufi;
00246
00247 if (av_new_packet(pkt, s->frame_size) < 0)
00248 return AVERROR(EIO);
00249 for(;;) {
00250 struct timeval tv;
00251 fd_set fds;
00252
00253 tv.tv_sec = 0;
00254 tv.tv_usec = 30 * 1000;
00255
00256 FD_ZERO(&fds);
00257 FD_SET(s->fd, &fds);
00258
00259
00260 (void) select(s->fd + 1, &fds, 0, 0, &tv);
00261
00262 ret = read(s->fd, pkt->data, pkt->size);
00263 if (ret > 0)
00264 break;
00265 if (ret == -1 && (errno == EAGAIN || errno == EINTR)) {
00266 av_free_packet(pkt);
00267 pkt->size = 0;
00268 pkt->pts = av_gettime();
00269 return 0;
00270 }
00271 if (!(ret == 0 || (ret == -1 && (errno == EAGAIN || errno == EINTR)))) {
00272 av_free_packet(pkt);
00273 return AVERROR(EIO);
00274 }
00275 }
00276 pkt->size = ret;
00277
00278
00279 cur_time = av_gettime();
00280 bdelay = ret;
00281 if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
00282 bdelay += abufi.bytes;
00283 }
00284
00285 cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels);
00286
00287
00288 pkt->pts = cur_time;
00289
00290 if (s->flip_left && s->channels == 2) {
00291 int i;
00292 short *p = (short *) pkt->data;
00293
00294 for (i = 0; i < ret; i += 4) {
00295 *p = ~*p;
00296 p += 2;
00297 }
00298 }
00299 return 0;
00300 }
00301
00302 static int audio_read_close(AVFormatContext *s1)
00303 {
00304 AudioData *s = s1->priv_data;
00305
00306 audio_close(s);
00307 return 0;
00308 }
00309
00310 #ifdef CONFIG_OSS_DEMUXER
00311 AVInputFormat oss_demuxer = {
00312 "oss",
00313 "audio grab and output",
00314 sizeof(AudioData),
00315 NULL,
00316 audio_read_header,
00317 audio_read_packet,
00318 audio_read_close,
00319 .flags = AVFMT_NOFILE,
00320 };
00321 #endif
00322
00323 #ifdef CONFIG_OSS_MUXER
00324 AVOutputFormat oss_muxer = {
00325 "oss",
00326 "audio grab and output",
00327 "",
00328 "",
00329 sizeof(AudioData),
00330
00331
00332
00333 #ifdef WORDS_BIGENDIAN
00334 CODEC_ID_PCM_S16BE,
00335 #else
00336 CODEC_ID_PCM_S16LE,
00337 #endif
00338 CODEC_ID_NONE,
00339 audio_write_header,
00340 audio_write_packet,
00341 audio_write_trailer,
00342 .flags = AVFMT_NOFILE,
00343 };
00344 #endif