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🎥 Command line media player
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C
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#include <assert.h>#include <math.h>#include <limits.h>
#include <libavutil/common.h>#include <libavutil/log.h>#include <libavutil/dict.h>#include <libavutil/opt.h>#include <libavutil/error.h>#include <libavutil/cpu.h>#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>
#include "config.h"
#include "common/common.h"#include "common/msg.h"#include "demux/packet.h"#include "demux/stheader.h"#include "misc/bstr.h"#include "video/fmt-conversion.h"#include "av_common.h"#include "codecs.h"
int mp_lavc_set_extradata(AVCodecContext *avctx, void *ptr, int size){ if (size) { av_free(avctx->extradata); avctx->extradata_size = 0; avctx->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE); if (!avctx->extradata) return -1; avctx->extradata_size = size; memcpy(avctx->extradata, ptr, size); } return 0;}
enum AVMediaType mp_to_av_stream_type(int type){ switch (type) { case STREAM_VIDEO: return AVMEDIA_TYPE_VIDEO; case STREAM_AUDIO: return AVMEDIA_TYPE_AUDIO; case STREAM_SUB: return AVMEDIA_TYPE_SUBTITLE; default: return AVMEDIA_TYPE_UNKNOWN; }}
AVCodecParameters *mp_codec_params_to_av(struct mp_codec_params *c){ AVCodecParameters *avp = avcodec_parameters_alloc(); if (!avp) return NULL;
// If we have lavf demuxer params, they overwrite by definition any others. if (c->lav_codecpar) { if (avcodec_parameters_copy(avp, c->lav_codecpar) < 0) goto error; return avp; }
avp->codec_type = mp_to_av_stream_type(c->type); avp->codec_id = mp_codec_to_av_codec_id(c->codec); avp->codec_tag = c->codec_tag; if (c->extradata_size) { avp->extradata = av_mallocz(c->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!avp->extradata) goto error; avp->extradata_size = c->extradata_size; memcpy(avp->extradata, c->extradata, avp->extradata_size); } avp->bits_per_coded_sample = c->bits_per_coded_sample;
// Video only avp->width = c->disp_w; avp->height = c->disp_h;
// Audio only avp->sample_rate = c->samplerate; avp->bit_rate = c->bitrate; avp->block_align = c->block_align; avp->channels = c->channels.num; if (!mp_chmap_is_unknown(&c->channels)) avp->channel_layout = mp_chmap_to_lavc(&c->channels);
return avp;error: avcodec_parameters_free(&avp); return NULL;}
// Set avctx codec headers for decoding. Returns <0 on failure.int mp_set_avctx_codec_headers(AVCodecContext *avctx, struct mp_codec_params *c){ enum AVMediaType codec_type = avctx->codec_type; enum AVCodecID codec_id = avctx->codec_id; AVCodecParameters *avp = mp_codec_params_to_av(c); if (!avp) return -1;
int r = avcodec_parameters_to_context(avctx, avp) < 0 ? -1 : 0; avcodec_parameters_free(&avp);
if (avctx->codec_type != AVMEDIA_TYPE_UNKNOWN) avctx->codec_type = codec_type; if (avctx->codec_id != AV_CODEC_ID_NONE) avctx->codec_id = codec_id; return r;}
// Pick a "good" timebase, which will be used to convert double timestamps// back to fractions for passing them through libavcodec.AVRational mp_get_codec_timebase(struct mp_codec_params *c){ AVRational tb = {c->native_tb_num, c->native_tb_den}; if (tb.num < 1 || tb.den < 1) { if (c->reliable_fps) tb = av_inv_q(av_d2q(c->fps, 1000000)); if (tb.num < 1 || tb.den < 1) tb = AV_TIME_BASE_Q; }
// If the timebase is too coarse, raise its precision, or small adjustments // to timestamps done between decoder and demuxer could be lost. if (av_q2d(tb) > 0.001) { AVRational r = av_div_q(tb, (AVRational){1, 1000}); tb.den *= (r.num + r.den - 1) / r.den; }
av_reduce(&tb.num, &tb.den, tb.num, tb.den, INT_MAX);
if (tb.num < 1 || tb.den < 1) tb = AV_TIME_BASE_Q;
return tb;}
static AVRational get_def_tb(AVRational *tb){ return tb && tb->num > 0 && tb->den > 0 ? *tb : AV_TIME_BASE_Q;}
// Convert the mpv style timestamp (seconds as double) to a libavcodec style// timestamp (integer units in a given timebase).int64_t mp_pts_to_av(double mp_pts, AVRational *tb){ AVRational b = get_def_tb(tb); return mp_pts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : llrint(mp_pts / av_q2d(b));}
// Inverse of mp_pts_to_av(). (The timebases must be exactly the same.)double mp_pts_from_av(int64_t av_pts, AVRational *tb){ AVRational b = get_def_tb(tb); return av_pts == AV_NOPTS_VALUE ? MP_NOPTS_VALUE : av_pts * av_q2d(b);}
// Set dst from mpkt. Note that dst is not refcountable.// mpkt can be NULL to generate empty packets (used to flush delayed data).// Sets pts/dts using mp_pts_to_av(ts, tb). (Be aware of the implications.)// Set duration field only if tb is set.void mp_set_av_packet(AVPacket *dst, struct demux_packet *mpkt, AVRational *tb){ av_init_packet(dst); dst->data = mpkt ? mpkt->buffer : NULL; dst->size = mpkt ? mpkt->len : 0; /* Some codecs (ZeroCodec, some cases of PNG) may want keyframe info * from demuxer. */ if (mpkt && mpkt->keyframe) dst->flags |= AV_PKT_FLAG_KEY; if (mpkt && mpkt->avpacket) { dst->side_data = mpkt->avpacket->side_data; dst->side_data_elems = mpkt->avpacket->side_data_elems; if (dst->data == mpkt->avpacket->data) dst->buf = mpkt->avpacket->buf; dst->flags |= mpkt->avpacket->flags; } if (mpkt && tb && tb->num > 0 && tb->den > 0) dst->duration = mpkt->duration / av_q2d(*tb); dst->pts = mp_pts_to_av(mpkt ? mpkt->pts : MP_NOPTS_VALUE, tb); dst->dts = mp_pts_to_av(mpkt ? mpkt->dts : MP_NOPTS_VALUE, tb);}
void mp_set_avcodec_threads(struct mp_log *l, AVCodecContext *avctx, int threads){ if (threads == 0) { threads = av_cpu_count(); if (threads < 1) { mp_warn(l, "Could not determine thread count to use, defaulting to 1.\n"); threads = 1; } else { mp_verbose(l, "Detected %d logical cores.\n", threads); if (threads > 1) threads += 1; // extra thread for better load balancing } // Apparently some libavcodec versions have or had trouble with more // than 16 threads, and/or print a warning when using > 16. threads = MPMIN(threads, 16); } mp_verbose(l, "Requesting %d threads for decoding.\n", threads); avctx->thread_count = threads;}
static void add_codecs(struct mp_decoder_list *list, enum AVMediaType type, bool decoders){ void *iter = NULL; for (;;) { const AVCodec *cur = av_codec_iterate(&iter); if (!cur) break; if (av_codec_is_decoder(cur) == decoders && (type == AVMEDIA_TYPE_UNKNOWN || cur->type == type)) { mp_add_decoder(list, mp_codec_from_av_codec_id(cur->id), cur->name, cur->long_name); } }}
void mp_add_lavc_decoders(struct mp_decoder_list *list, enum AVMediaType type){ add_codecs(list, type, true);}
// (Abuses the decoder list data structures.)void mp_add_lavc_encoders(struct mp_decoder_list *list){ add_codecs(list, AVMEDIA_TYPE_UNKNOWN, false);}
char **mp_get_lavf_demuxers(void){ char **list = NULL; void *iter = NULL; int num = 0; for (;;) { const AVInputFormat *cur = av_demuxer_iterate(&iter); if (!cur) break; MP_TARRAY_APPEND(NULL, list, num, talloc_strdup(NULL, cur->name)); } MP_TARRAY_APPEND(NULL, list, num, NULL); return list;}
int mp_codec_to_av_codec_id(const char *codec){ int id = AV_CODEC_ID_NONE; if (codec) { const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(codec); if (desc) id = desc->id; if (id == AV_CODEC_ID_NONE) { AVCodec *avcodec = avcodec_find_decoder_by_name(codec); if (avcodec) id = avcodec->id; } } return id;}
const char *mp_codec_from_av_codec_id(int codec_id){ const char *name = NULL; const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id); if (desc) name = desc->name; if (!name) { AVCodec *avcodec = avcodec_find_decoder(codec_id); if (avcodec) name = avcodec->name; } return name;}
bool mp_codec_is_lossless(const char *codec){ const AVCodecDescriptor *desc = avcodec_descriptor_get(mp_codec_to_av_codec_id(codec)); return desc && (desc->props & AV_CODEC_PROP_LOSSLESS);}
// kv is in the format as by OPT_KEYVALUELIST(): kv[0]=key0, kv[1]=val0, ...// Copy them to the dict.void mp_set_avdict(AVDictionary **dict, char **kv){ for (int n = 0; kv && kv[n * 2]; n++) av_dict_set(dict, kv[n * 2 + 0], kv[n * 2 + 1], 0);}
// For use with libav* APIs that take AVDictionaries of options.// Print options remaining in the dict as unset.void mp_avdict_print_unset(struct mp_log *log, int msgl, AVDictionary *dict){ AVDictionaryEntry *t = NULL; while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) mp_msg(log, msgl, "Could not set AVOption %s='%s'\n", t->key, t->value);}
// If the name starts with "@", try to interpret it as a number, and set *name// to the name of the n-th parameter.static void resolve_positional_arg(void *avobj, char **name){ if (!*name || (*name)[0] != '@' || !avobj) return;
char *end = NULL; int pos = strtol(*name + 1, &end, 10); if (!end || *end) return;
const AVOption *opt = NULL; int offset = -1; while (1) { opt = av_opt_next(avobj, opt); if (!opt) return; // This is what libavfilter's parser does to skip aliases. if (opt->offset != offset && opt->type != AV_OPT_TYPE_CONST) pos--; if (pos < 0) { *name = (char *)opt->name; return; } offset = opt->offset; }}
// kv is in the format as by OPT_KEYVALUELIST(): kv[0]=key0, kv[1]=val0, ...// Set these options on given avobj (using av_opt_set..., meaning avobj must// point to a struct that has AVClass as first member).// Options which fail to set (error or not found) are printed to log.// Returns: >=0 success, <0 failed to set an optionint mp_set_avopts(struct mp_log *log, void *avobj, char **kv){ return mp_set_avopts_pos(log, avobj, avobj, kv);}
// Like mp_set_avopts(), but the posargs argument is used to resolve positional// arguments. If posargs==NULL, positional args are disabled.int mp_set_avopts_pos(struct mp_log *log, void *avobj, void *posargs, char **kv){ int success = 0; for (int n = 0; kv && kv[n * 2]; n++) { char *k = kv[n * 2 + 0]; char *v = kv[n * 2 + 1]; resolve_positional_arg(posargs, &k); int r = av_opt_set(avobj, k, v, AV_OPT_SEARCH_CHILDREN); if (r == AVERROR_OPTION_NOT_FOUND) { mp_err(log, "AVOption '%s' not found.\n", k); success = -1; } else if (r < 0) { char errstr[80]; av_strerror(r, errstr, sizeof(errstr)); mp_err(log, "Could not set AVOption %s='%s' (%s)\n", k, v, errstr); success = -1; } } return success;}